On Tue, 2014-06-24 at 22:29 -0600, Dann Frazier wrote:

On Fri, Jun 20, 2014 at 5:18 PM, Iyappan Subramanian

quoted

+       ring->desc_addr = dma_zalloc_coherent(dev, size, &ring->dma,
+                                             GFP_KERNEL);

Iyappan,
When testing this driver on a 3.16-rc2 base, I'm finding that
desc_addr gets assigned to NULL here, which results in an oops later
on (see below).

I wasn't seeing this before (3.15 base), so I'm guessing something
changed upstream, or in my config, to change this behavior. But it
does illuminate a place where we could maybe use some better error
handling (also see below).

https://lkml.org/lkml/2014/6/23/10